The optimal management of electrical power systems is based in particular on the reliability, availability and communication skills of protection, measurement and automation devices.
The NPG915 generator protection IED is well suited for machines requiring complete generator protections. It can be combined with NPT916 to protect larger machines requiring differential protection and greater protection redundancy.
The NPG915 communicates using various protocols including IEC 61850 substation communication standard.

MAIN FEATURES

  Hardware (standard)

• Large graphic display with customizable mimic
• Push buttons for local control of the up to 5 objects
• 16 freely configurable leds
• 5 current inputs
• 4 voltage inputs
• 5+1 output units (standard)
• 3 digital inputs (standard)
• 1 Front Ethernet port, 1 rear Ethernet port, 1 rear RS485 port

  Protection Functions

• Three-phase overcurrent, 4 stages INST, DT or IDMT [50/51]
• Earth-fault (sensitive), 4 stages INST, DT or IDMT [50N/51N(S)]
• Harmonic overcurrent / inrush blocking, 4 stages INST, DT or IDMT [50H/51H/68H]
• Current unbalance/broken conductor, 4 stages INST, DT or IDMT [46/46R/46L]
• Directional overcurrent, 4 stages INST, DT or IDMT [67]
• Directional (sensitive) earth-fault, 4 stages INST, DT or IDMT [67N]
• Overvoltage, 4 stages INST, DT or IDMT [59]
• Undervoltage, 4 stages INST, DT or IDMT [27]
• Zero sequence overvoltage, 4 stages INST, DT or IDMT [59N]
• Positive sequence under/overvoltage, negative sequence overvoltage, 4 stages INST, DT or IDMT [59P/27P/47]
• Over/under frequency, 4 stages INST or DT [81O/81U]
• Rate of change of frequency, 4 stages INST or DT or IDMT [81R]
• Loss of field [40]
• Power factor [55]
• Voltage restrained overcurrent [51V]
• Field ground / 100% stator earth-fault [64S]
• Over/Under/Reverse power [32/37/32R]
• Generator thermal overload [49M]
• Under impedance [21]
• Overexcitation protection [24]
• Vector jump [78]
• Breaker failure protection [50BF/52BF]
• Arc protection (option) [50ARC]

  Disturbance and Event recording

• Up to 100 recordings @ 64 samples/cycle (3.2 kHz)
• Recording lenght configurable from 0.1 to 1800 seconds
• Pre trigger configurable from 5 to 95%
• Non-volatile event records: 15000

  Measurement and Supervision

• Phase and residual currents (IL1, IL2, IL3, I01, I02)
• Voltage measurements (UL1-UL3, U12-U31, U0, SS)
• Fault locator [21FL]
• Current and voltage harmonics (up to 31st)
• Current THD
• Frequency (f)
• Power (P, Q, S, pf)
• Energy (E+, E-, Eq+, Eq-)
• Circuit breaker wear (CBW)
• Disturbance recorder (3.2 kHz)
• Current transformer supervision (CTS)
• Fuse failure (VTS)
• Trip circuit supervision (74TC)

  Control

• Controllable objects: 5
• Synchrocheck [25]
• 8 setting groups

  Communication protocols standard

• IEC 61850
• IEC 60870-5-103/101/104
• Modbus/RTU, Modbus TCP/IP
• DNP 3.0, DNP 3.0 over TCP/IP
• SPA

  Options (3 slots)

• Digital inputs optional: +8 per card
• Digital outputs optional: +5 per card (2 cards max.)
• Arc protection (12 sensors +2xHSO +BI)
• 2 x mA input + 6-8 x RTD input (2 cards max.)
• Double LC Ethernet 100Mb
• RS232 + serial fibre PP/PG/GP/GG (option)